The Sharia of Moses in the TORAPart 2 - The 365 Prohibitions of the Tora

87 - REMOVING THE BREASTPLATE FROM THE EPHOD

Exodus 28:28 -- “They shall bind the breastplate by means of its rings to the rings of the ephod, using a blue cord, so that it is above the intricately woven band of the ephod, and so that the breastplate does not come loose from the ephod.”

By this prohibition, it is forbidden to remove the breastplate from the ephod worn by the high priest when ministering in the sanctuary.